Der Perlentaucher unter den Buchläden Eichendorff21

Razvan Gelca is a Professor at Texas Tech University, USA, and holds a PhD in Mathematics from the University of Iowa, USA (1997). He coached the US International Mathematical Olympiad Team and co-authored, with Titu Andreescu, the books "Putnam and Beyond," published by Springer, and "Mathematical Olympiad Challenges" (Birkhäuser), both now in their 2nd edition. Ionut Onisor is a Professor at the Colegiul National de Informatica Tudor Vianu, Romania. Carlos Yuzo Shine teaches at the Colégio Etapa, Brazil. He studied Production Engineering at the University of São Paulo, Brazil, and holds a Master's degree (2018) from Texas A&M; University, USA. He has been coordinating and coaching Mathematical Olympiad teams in Brazil since 2002.